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M2.4 earthquake 71 km SE of Hōlualoa, Hawaii, United States

A magnitude 2.4 earthquake struck 71 km SE of Hōlualoa, Hawaii, United States at 01:57 local time (11:57 UTC) on 28 Sept 2026, at a depth of 33 km, according to USGS. The solution is preliminary and may be revised.

Data: USGS · updated 2026-09-28 12:17 UTC · automatic solution

Magnitude
2.4micro
duration magnitude (md)
Depth
33.3 km
Status
Automatic
Origin time
2026-09-28 11:57:06 UTC
Local: 28 Sept 2026, 01:57:06 (Pacific/Honolulu)
Epicentre
19.133° N, 155.517° W

Circles show this event and others within 30 km from 7 days before to 30 days after. Lines: plate boundaries and GEM active faults. Open on the live map

Nearby places

Distance and estimated shaking at nearby places
PlaceDistanceEst. shaking
HōlualoaHawaii, United States · pop. 8,53871 kmINot felt
Kailua-KonaHawaii, United States · pop. 11,97576 kmINot felt
HiloHawaii, United States · pop. 43,26380 kmINot felt
HonoluluHawaii, United States · pop. 350,964344 kmINot felt

Shaking is an estimate from the intensity prediction equation of Allen, Wald & Worden (2012), not an observation. Local ground and buildings can change it by a level or more.

Every agency's solution

Agencies locate earthquakes with their own stations and methods, so their numbers differ. We match reports of the same event by time, distance and magnitude and show them side by side. The headline uses USGS · HV.

AgencyMagnitudeDepthEpicentreTime offsetStatus
USGS · HVheadlineHawaiian Volcano Observatory via U.S. Geological Survey2.4 md33.3 km19.13° N, 155.52° W–Automatic

How big was it?

Usually not felt. Recorded by nearby seismometers; thousands occur worldwide every day.

It released roughly the energy of 56 kg of TNT. Magnitude is logarithmic: each whole step means about 32 times more energy and 10 times larger waves on a seismogram. Depth matters too: at 33 km this was a shallow earthquake, which is felt more strongly at the surface than a deeper one of the same size.

M2.4 releases about 30× the energy of M1.4, and its waves are about 9.5× taller on a seismogram. Energy: 56 kg of TNT vs 2 kg of TNT.

Each square is the energy of one M1.4. Energy from log₁₀E = 1.5M + 4.8.

Aftershocks and nearby activity

5 later earthquakes within 30 km; the largest was M2.3 8 h ago. 67 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M2.4

5 later earthquakes nearby. Aftershock rates typically fall off roughly as 1/time (Omori's law).

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
0.411.830
0.572.134
0.802.333
0.951.732
1.502.333
  1. 2.371 km SE of Hōlualoa, Hawaii, United States09-28 12:45
  2. 2.371 km SE of Hōlualoa, Hawaii, United States09-28 13:27
  3. 2.171 km SE of Hōlualoa, Hawaii, United States09-28 12:31
  4. 1.873 km SE of Hōlualoa, Hawaii, United States09-28 12:21
  5. 1.773 km SE of Hōlualoa, Hawaii, United States09-28 12:54

Did you feel it?

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Reports on SeismoAtlas

No reports yet.

Event id hv75044617. First recorded here 28 Sept 2026, 17:32:07 UTC. Solutions: USGS · HV (usgs:hv75044617). Cite as: SeismoAtlas, “M2.4 earthquake 71 km SE of Hōlualoa, Hawaii, United States”, https://seismoatlas.com/earthquake/hv75044617-m2-4-earthquake-71-km-se-of-holualoa-hawaii-united-states, data from USGS.

JSON: /api/v1/events/hv75044617. SeismoAtlas is not an official warning service.